Saw filing machine



March 8, 1938. H. E. HAMILTON SAW FILING MACHINE Filed May 2, 1936 2 Sheets-Sheet 1 Z W. W7. z 2 2% M 9 H. E. HAMILTON 2,110,396

SAW FILING MACHINE March 8, 1938.

Filed May 2, 1956 2 Sheets-Sheet 2 Patented Mar. 8, 1938 UNITED STATES PATENT OFFICE 2 Claims.

The object of my invention is to provide a saw filing machine of simple construction, by which a saw can be filedby hand rapidly and accurately.

Another object is to provide such a machine whichrcan readily be connected with a source of power for power operation.

Another object is to provide in such a machine saw filing mechanism and means actuated thereby for automatically moving the saw after each filing operation.

Another object is to provide novel mechanism for guiding the file for saw filing operations.

With these and other objects in view, my invention consists in the construction, arrangement and combination of my saw filing machine, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figurel is a top or plan view of a saw filing machine embodying my invention shown in somewhat diagrammatic form.

Figure 2 is a front elevation of the same.

Figure 2a is a top or plan view of the cam which functions in advancing the saw after each filing operation.

Figure 3 is a detail, sectional view taken on the line 33 of Figure 1.

Figure 3a is a sectional viewtaken on the line 3a3a. of Figure 3.

Figure 4 is a detail, sectional view taken on the line 4-4 of Figure 2.

Figure 5 is a detail, sectional view taken on the line 55. of Figure 3.

Figure 6 is a sectional view taken on the line 6-6 of Figure 1.

Figure '7 is a view similar to that of Figure 3 illustrating a modified form of file supporting mechanism.

Figure 8 is a detail, sectional view taken on the line 88 of F'mure 7.

Figure 9 is a detail, sectional view taken on the line 9-9 of Figure '7; and

Figure 10 is a sectional View on the line llllll of Figure 8.

In the accompanying drawings, I have used the reference numeral 10 to indicate generally a bench or other support on which my saw filing machine may be mounted.

Themachine itself has a base I I, which may be fastened to the support ID by means of a bolt I2 or otherwise.

From what may be called the rear end of the base I I, there extends upwardly an arm 13 which has a central, vertical opening M, through which operating parts may project.

At the upperend of the arm I3 is a forwardly extending arm 15, from which the bifurcated arm 11 6 extends downwardly.

From the forward end of the base II, the leg I! hangs downwardly and terminates in the forward extension 18. I

A rectangular frame A has the top I9, the sides and the bottom 2|. The topl9 overlies the arm 15 and the bottom 2| rests on the extension 18. The top I9 is fastened to the arm 15 by means of a screw 22, having a cylindrical portion 23 journaled in the top l9 and a threaded portion 24 screwed into the arm .15.

The bottom 2| is pivoted or journaled on a stud 25 extending upwardly from the extension l8.

The stud 25 and screw 22 are aligned with each other and the frame A can be swung to different angles as illustrated by the full lines and dotted lines in Figure 1, on a vertical axis extending through the centers of the stud 25 and screw 22.

Anysuitable means may be provided for looking the frame A-initsadjusted positions.

In Figure 6, I have shown a stud 21 extending upwardly from the arm I5. The stud 21 is angular in cross section and has an upwardly extended threaded member 28 on which is a lock nut 29. Between the lock nut 29 and the arm I5 is a sleeve 30, having an angular bore to receive the stud 21.

Projecting from the sleeve 30 is a locking finger 31, which may be selectively received in any one of a series of notches 32 in the curved lug 33 on the top frame member l9. (See Figures 1, 3 and 6.)

The sides 20 of the frame A have in their lower portions the openings 34. The sides 20 are connected and braced by transverse bars 35, 36 as shown in Figure 3. The rear bar 35 has near its center a forwardly projecting flange 31. Threaded through the bar 36 is a set screw 38 having swiveled on its rear end a guide bar 39 (Figures 3 and 3a).

Guide posts 40 extend from the guide bar 39 through suitable holes in the bar 36 (see Fig- -ure s 2 and 3a), to keep the guide bar 39 in proper alignment. I

The purpose of the flange 31 and bar 39 is to afford guide means and backing for the saw blade just below the edge of the saw for holding it firmly inplace during the filing operation.

The flange 3! and bar 39 do not grip the saw blade, but permit it to slide, and they prevent it from moving sidewise of the saw during the filing operation.

Saw holding frame I provide a saw holding frame, which will now be described.

The saw holding frame indicated generally at B in Figures 2 and 7, comprises a flat bottom strip 4| on which rests three spaced blade holders 42. Each blade holder 42 has generally the form of an upwardly opening U-shaped member with its base 42a resting on the strip 4| and with-.its

arms 42b extending upwardly and inclined toward each other. elongated slots 43.

Secured to the upper ends of the arms 42b are the blade holding strips 44.

The saw is slipped edge upward between the three sets of arms 42b.

Bolts 45 are extended through the slots 43 of the respective arms 42b and have wing nuts 46 by which they may be tightened.

After the saw is inserted between the pairs of arms with its cutting edge spaced slightly above the strips 44, the bolts 45 are adjusted to position under the back of the saw and the wing nuts are tightened, whereupon the strips 44 will tightly grip the saw blade and the bolts 45 will afford means for resisting downward movement of the saw.

The saw frame B may then be inserted into the openings 34 in the frame. members 20 as shown. in Figures 2 and 3. V

The saw is indicated by the number 41 and its teeth are further indicated by the numeral 48.

The strip 4| is supported at the bottoms of the openings 34 and is wide enough to fit snugly but to slide freely in such openings.

File holding and operating means I.will now describe the file holding and operating means.

Connecting the arms l4 and I6 near the upper parts thereof are laterally spaced plates 50 of substantial vertical width. They have on their inner facesopposite pairs of cam grooves, 5|.

These grooves may be formed. in any suitable way as for example by millingout the inner faces of the plates 50 and then fastening in the recesses the cam plates 52.

The grooves 5| have the parallel upper and lower strips 5|a and 5|b and the substantially vertical front strips 5|c and the converging rear strips 5 Id. Y

The plates 52 have slots'53 in, which are pivoted the guide pawls 54, the free ends of which normally drop into the lower inclined cam groove strips 5|d as shown in Figure 3.

The upper bar 55 slides between the plates 50 and has the anti-friction rollers 56 on opposite sides, projecting into the cam grooves 5|.

A lower horizontalbar 51 also slides between the plates 50 and has on its rear end an operating handle 58.

Upright posts 58 extend through the bar 55 and are adjustably fastened therein by means of set screws 60. The posts 59 extend downwardly and are slidably projected through the bar 51.

These posts have collars 6| at their lower ends, andIpreferably provide coil springs 82 between the collars 6| and the bar 51.

Extending downwardly from the posts 59 are gripping clamps 63 for holding the shanks 84 of ordinary drill chucks 55 for holding the ends of an ordinary three-corner file B8.

The arms 42b have vertically The bar 51 has fore-and-aft spaced downwardly extending flanges 61 and 68, which project laterally beyond the bar and slide on suitably mounted rods 69.

By grasping the handle 58 and swinging it back and forth, the file may be manipulated for filing the teeth of the saw as hereinafter more fully explained.

The flange 68 has a lug 18 to which a pitman H may be connected for power operation of the filing mechanism.

For sliding the saw and saw frame laterally automatically when the handle 58 is so manipulated, I provide the following means:

Saw advancing device 'Projecting inwardly from the left-hand frame member 20 is a post 12 to which is pivoted an upwardly inclined link I3. Pivoted to the upper end of the link 13 is an internally threaded collar 14. A parallel link 15 is pivoted to the post 12 and also hasv at its upper end an internally threaded collar 16, aligned horizontally with the collar 14.

A threaded rod 11 is adjustably mounted in the collars. l4 and I6 and hasat its left-hand end the wing head 18 for convenient manipulation.

The link 15 projects downwardly below the post 12 and is normally yieldingly impelled at its lower end toward the left-hand frame member 20 by means of a coil spring 80. A link 8| is pivoted to the lower end of the link 15 and projects to the right in the machine, and is pivoted to an operating pawl 82. V

Pivoted to the operating pawl 82 is another link 83, which slides telescopically in the sleeve 84. The sleeve 84 has an elongated slot 85in one wall. A collar 86 slides on the sleeve 84. A screw 81 is mounted in the collar 86, so as to forma stop for the link 83.

Near its left-hand end, the sleeve 84 is pivoted as at 89 to the left-hand frame member 20. Projecting to the left from the frame member 20 is a plate 90 in which is a curved slot 9|. A bolt 92 extends through the slot 9| and the lefthand end of the sleeve 84 and has a wing nut 83 thereon.

On top of the bar 55 is a cam plate 94 shown in Figures 2 and 2a, which cooperates with the threaded rod 11 to actuate the pawl 82 for moving the saw after each filing operation.

Before describing the modified form of the file operating mechanism of Figures '7, 8, 9 and 10, I shall explain the operation of the form of the device already described.

Let it be assumed that the saw has been clamped into the saw holding frame, and that the saw holding frame has been inserted into the holes 34 ofthe frame members 28, and that the guide bar 39 has been adjusted, so as to hold the saw against any substantial give during the filing operation, but yet to permit the saw to move lengthwise.

Let us assume further that the frame A has been locked by means of the locking finger 3| in position so that the saw will be exactly at right angles to the axis, of the file 66.

Let it be. further assumed that the file has been installed in the file operating mechanism and that the parts are in the position shown in Figure 3 ready for operation.

The saw will be at the left of its position shown in Figure 2, so that the teeth" may be filed with a straight cross filing action, beginning atthe end nearest to the handle of the saw.

The handle'58 of the saw operating mechanism grasped and pushed rearwardly, which will be toward the left as shown in Figure 3.

It will be noted that the rollers 56 have started up in the lower inclined strips 5Id of the cam grooves 51. Further movement of the handle 58 to the-left carries the bars 5'! and 55 to the left, causing the rollers 5-5 to travel 'rearwardly and to the converging ends of the inclined groove strips 5| d, passing under and raising-the pawls 54. At the extreme rear-ends of the cam -grooves, the rollers 56 clear the cams, whereupon the cams drop. The handle58 is then pulle'd'forwardly toward the operator and awayLfrom the machine, whereupon the rollers 56 will travel upwardly and forwardly on the pawls 54, andin the upper strips '5IcZ ofthe cam grooves 5 I, thence further forwardly in the strips 5Ia until they reach the strips 5Ic, when they will drop downwardly, causing the posts59 to slide downwardly in the bar 51, carrying with them the file 66 until it drops to position for filing the first tooth.

Then on the rearward stroke of the handle 58, the file will operate on the first or right-hand tooth of the'saw, viewing the parts as shown in Figure 2.

The-cam plate 94 is so located on the bar 55 and the threaded rod ll is-so located that during the forward stroke of the file operating mechanism, the inner end of the threaded rod 1''! will be engaged by the cam face of the cam plate 94 and the threaded rod ll will be pushedto the left from its position shown in Figure 2.

The degree of leftward movement of the threaded rod ll depends upon the adjustment it has been given in the collars Mand 16. It can be so adjusted that the saw sliding mechanism will be moved the distance of one tooth.

The leftward movement of the threaded screw 11 actuates the links I3 and'T5 and the link 8| for swinging the pawl 82 from its position shown in Figure 2 to position where it engages a tooth of the saw 41 and positions the saw to the right the distance equivalent to one tooth.

All the operator has to do to continue the filing operation is to reciprocate the handle 58 forwardly as indicated by the upper arrow in Figure 3 and rearwardly as indicated by, the lower arrow in Figure 3.

With each stroke, the saw will be advanced one-toothed distance to the right until the first filing operation is completed.

Then the teeth are set in the ordinary way and the filing operation can be completed.

After the teeth are set, the frame A is secured to one of the angular posts shown in Figure 1 in dotted lines.

For so adjusting the frame, the nut 29 shown in Figure 6 may be removed and the sleeve lifted off the stud 2?, and the frame swung to proper position, whereupon sleeve 30 may be replaced with its locking tongue 9| in the proper slots 32 and then the nut 29 may be replaced.

Thereupon the threaded rod TI is adjusted in the collars I4 and I6 so that each operation of the cam plate 94 on the threaded rod I! will advance the saw two teeth.

After each second tooth has been filed, the frame A can be adjusted to the second angular position shown in Figure l and the alternate teeth may be filed.

Modified form of file-operating mechanism In Figures 7, 8, 9, and 10 is shown a modified form of file operating mechanism.

tending flange v99 arranged to coact with lthe flange 96 for preventing chattering of the saw blade and for holding it'in place while still permittingit to slide lengthwise.

A set screw I00 is journaled in the arm 98 and screws into the arm 91 for permitting adjustment of the arm 98.

Referring now to the file operatingmechanism proper, I provide a plate fill, having the upwardly projecting flanges I02, which project laterally beyond the plate NH, and are slidably mounted on the rods I03.

A .pair of fore-and-aft spaced arms I04 are pivotedto the under side ofthe plate I'0I to swing on horizontal transverse axes.

Secured to the lower end of each arm I04 at the I. sides thereof are the metal strips I05, which are spread at their lower ends as at N511 and are pivoted to a split ring I06, which is intended to grip the shank 64 of the chuck 65, such as has been already described.

The split ring I06 has the spacedprojecting arms I01 which may be adjusted by means of a screw I08.

A pair of parallel operating bars I09 are pivoted to the arms I04, as shown in Figures '7 and 8, and have at their forward ends the operating handle IIO.

On the left-hand bar' I09 is the cam I I I, which cooperates with the screw 11 in the same manner asdoes the cam plate 94 of the first-described file operating mechanism.

Hanging from the member I5 is an arm IIZ, which has at its lower end a flange H3 projecting toward the bars I09 and carrying an upstanding pin II4. A spring guide 5 extends downwardly from the plate IM and has near its lower end a member IIB, projecting toward the bars I09 and having a flat upper surface forming a shoulder.

Projecting downwardly from the member H6 is a double-faced cam II! which is arranged to coact with the pin II4. A spring H8 is connected at one end to the plate IOI and at the other end to one of the arms I04, on one of the bars I09, to resist swinging movement of the bars I09 toward the plate IOI.

It might be mentioned that the hinges I20 at the upper end of the arms I04 are so arranged as to permit the bars I09 to swing upwardly and rear-wardly toward the plate IOI as illustrated by the dotted lines in Figure '7 but to prevent the swinging of the arms I04 past vertical in the other direction.

In practical operation of the form of the device now under consideration, the saw is mounted in its saw holding frame, which is then placed in the holes 34 of the frame A and the arm 98 is adjusted for bringing the flange 99 to proper position to serve as backing for the saw blade.

Assuming that the parts are in the position shown in Figure '7 in full lines, the operator grasps the handle H0 and shoves it'rearwardly for moving the file across the saw and performing a filing operation.

The engagement of the file with the saw blade and the spring II8 prevents the bars I09 from swinging up toward the plate IOI during such filing stroke.

At the end of the filing stroke, however, the rearward flanges I02 strike the lugs I2I, so that the plate II can travel no 'farther. the arms I04 swing on their upper pivots and the bars I09 swing upwardly to their dotted line position shown in Figure 7.

The spring guide H5 is so arranged that the adjacent bar I09 strikes the extension II6 and shoves it aside during the upward Swinging movement of the bars I09 (see Figure 8).

However, as soon as the bar I09 clears the extension IIG, the resilience of the spring guide II5 swings the extension I I6 underneath the bar I09. Then upon the return stroke of the device from rear to front, one of the bars I09'will rest-on the extension I I6 until during the return stroke, the cam III reaches the pin H4 and is sprung, so as to move the extension IIIi outfrom under the bars I09.

The bars I09 then swing down to their full line position of Figure '7 for another sawing operation.

During'this same 'return stroke, the cam II I engages the screw I1 and causes the operation of the saw advancing pawl 82 heretofore described in connection with the explanation of the first form of my device.

The further operation of the mechanism now under considerationior completing the job of filing a saw will be obvious from the description already given in connection with the two forms of file handling mechanisms which have been explained.

It will, of course, be understood that the plate IOI may be connected witha, pitman or other power operating mechanism.

It will be seen from the foregoing description that my apparatus is such that the saw filing 'Thereupon operation may be done with a minimum of motion and efiort, that the saw is advanced automatically as the filing mechanism is operated, and that the parts may be quickly and easily adjusted for filing any ordinary saw.

Some changes may be made in the details of the construction and arrangement of the parts of my improved saw filing machine, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention: I

1. In a saw filing machine, a file operating mechanism comprising a pair of laterally spaced vertical plates 50, having cam grooves in their inner faces, the pivoted guide pawls 54 forming parts of the cam groove walls, a bar 55 arranged to slide between the plates having rollers traveling in the grooves, a lower bar horizontally slidable, file'holding means including uprights secured to the first bar, and vertically slidable in the lower bar, the; grooves being shaped to cause the rollers to travel horizontally during the filing stroke and to cause the rollers to travel on a higher level during the return stroke.

2. In a saw filing machine, a file operating mechanism comprising a pair of laterally spaced vertical plates 50, having cam grooves in their inner faces, pivoted guide, pawls 54 forming parts of the cam groove walls, a bar arranged to slide between the plates 50 having rollers traveling in the grooves, a lower bar horizontally slidable, file holding means including uprights secured to the first bar, and vertically slidable in the lower bar, a saw holding meanaand means actuated by the saw operating mechanism for intermittently advancing the saw in the saw holding means when the file operating means is actuated, the grooves being shaped to cause the rollers to travel horizontally during the filing stroke and to cause the rollers to travel on a higher level during the return stroke.

HERBERT E. HAMILTON. 

